Throughout our renovation works in the bedroom, there has been no wall between the room and the corridor, it being one of the first things we removed. For it to feel like a room again we needed that wall back.
We still had the stud wall framework
so with a bit of tightening up of all the joints and some cross braces to keep it square
and a trim of the floor to give us a straight edge for the room
we could screw the base piece to the floor
and screw the rest of the framework to that. With some celotex filling it all in it looked like a real wall!
It still needs extending up to, and attaching to, the ceiling
and then we can build in the door frame and continue the wall to the other wall.